@@ -219,7 +219,7 @@ fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
rpcrdma_defer_mr_recovery(mw);
mw = rpcrdma_get_mw(r_xprt);
if (!mw)
- return -ENOMEM;
+ return -ENOBUFS;
pageoff = offset_in_page(seg1->mr_offset);
seg1->mr_offset -= pageoff; /* start of page */
@@ -269,14 +269,14 @@ out_dmamap_err:
pr_err("rpcrdma: failed to dma map sg %p sg_nents %u\n",
mw->mw_sg, mw->mw_nents);
rpcrdma_defer_mr_recovery(mw);
- return -ENOMEM;
+ return -EIO;
out_maperr:
pr_err("rpcrdma: ib_map_phys_fmr %u@0x%llx+%i (%d) status %i\n",
len, (unsigned long long)dma_pages[0],
pageoff, mw->mw_nents, rc);
rpcrdma_defer_mr_recovery(mw);
- return rc;
+ return -EIO;
}
/* Invalidate all memory regions that were registered for "req".
@@ -382,7 +382,7 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
rpcrdma_defer_mr_recovery(mw);
mw = rpcrdma_get_mw(r_xprt);
if (!mw)
- return -ENOMEM;
+ return -ENOBUFS;
} while (mw->frmr.fr_state != FRMR_IS_INVALID);
frmr = &mw->frmr;
frmr->fr_state = FRMR_IS_VALID;
@@ -456,18 +456,18 @@ out_dmamap_err:
pr_err("rpcrdma: failed to dma map sg %p sg_nents %u\n",
mw->mw_sg, mw->mw_nents);
rpcrdma_defer_mr_recovery(mw);
- return -ENOMEM;
+ return -EIO;
out_mapmr_err:
pr_err("rpcrdma: failed to map mr %p (%u/%u)\n",
frmr->fr_mr, n, mw->mw_nents);
- rc = n < 0 ? n : -EIO;
rpcrdma_defer_mr_recovery(mw);
- return rc;
+ return -EIO;
out_senderr:
+ pr_err("rpcrdma: FRMR registration ib_post_send returned %i\n", rc);
rpcrdma_defer_mr_recovery(mw);
- return rc;
+ return -ENOTCONN;
}
static struct ib_send_wr *
@@ -569,7 +569,8 @@ unmap:
return;
reset_mrs:
- pr_warn("%s: ib_post_send failed %i\n", __func__, rc);
+ pr_err("rpcrdma: FRMR invalidate ib_post_send returned %i\n", rc);
+ rdma_disconnect(ia->ri_id);
/* Find and reset the MRs in the LOCAL_INV WRs that did not
* get posted. This is synchronous, and slow.
@@ -251,7 +251,7 @@ rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, unsigned int pos,
/* alloc the pagelist for receiving buffer */
ppages[p] = alloc_page(GFP_ATOMIC);
if (!ppages[p])
- return -ENOMEM;
+ return -EAGAIN;
}
seg[n].mr_page = ppages[p];
seg[n].mr_offset = (void *)(unsigned long) page_base;
@@ -558,7 +558,6 @@ out_sendbuf:
out_fail:
rpcrdma_buffer_put(req);
- r_xprt->rx_stats.failed_marshal_count++;
return NULL;
}
@@ -590,8 +589,19 @@ xprt_rdma_free(void *buffer)
rpcrdma_buffer_put(req);
}
-/*
+/**
+ * xprt_rdma_send_request - marshal and send an RPC request
+ * @task: RPC task with an RPC message in rq_snd_buf
+ *
+ * Return values:
+ * 0: The request has been sent
+ * ENOTCONN: Caller needs to invoke connect logic then call again
+ * ENOBUFS: Call again later to send the request
+ * EIO: A permanent error occurred. The request was not sent,
+ * and don't try it again
+ *
* send_request invokes the meat of RPC RDMA. It must do the following:
+ *
* 1. Marshal the RPC request into an RPC RDMA request, which means
* putting a header in front of data, and creating IOVs for RDMA
* from those in the request.
@@ -600,7 +610,6 @@ xprt_rdma_free(void *buffer)
* the request (rpcrdma_ep_post).
* 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP).
*/
-
static int
xprt_rdma_send_request(struct rpc_task *task)
{
@@ -630,11 +639,12 @@ xprt_rdma_send_request(struct rpc_task *task)
return 0;
failed_marshal:
- r_xprt->rx_stats.failed_marshal_count++;
dprintk("RPC: %s: rpcrdma_marshal_req failed, status %i\n",
__func__, rc);
if (rc == -EIO)
- return -EIO;
+ r_xprt->rx_stats.failed_marshal_count++;
+ if (rc != -ENOTCONN)
+ return rc;
drop_connection:
xprt_disconnect_done(xprt);
return -ENOTCONN; /* implies disconnect */
@@ -1151,7 +1151,7 @@ rpcrdma_ep_post(struct rpcrdma_ia *ia,
if (rep) {
rc = rpcrdma_ep_post_recv(ia, ep, rep);
if (rc)
- goto out;
+ return rc;
req->rl_reply = NULL;
}
@@ -1176,10 +1176,12 @@ rpcrdma_ep_post(struct rpcrdma_ia *ia,
rc = ib_post_send(ia->ri_id->qp, &send_wr, &send_wr_fail);
if (rc)
- dprintk("RPC: %s: ib_post_send returned %i\n", __func__,
- rc);
-out:
- return rc;
+ goto out_postsend_err;
+ return 0;
+
+out_postsend_err:
+ pr_err("rpcrdma: RDMA Send ib_post_send returned %i\n", rc);
+ return -ENOTCONN;
}
/*
@@ -1204,11 +1206,13 @@ rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
DMA_BIDIRECTIONAL);
rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail);
-
if (rc)
- dprintk("RPC: %s: ib_post_recv returned %i\n", __func__,
- rc);
- return rc;
+ goto out_postrecv;
+ return 0;
+
+out_postrecv:
+ pr_err("rpcrdma: ib_post_recv returned %i\n", rc);
+ return -ENOTCONN;
}
/**
Commit c93c62231cf5 ("xprtrdma: Disconnect on registration failure") added a disconnect for some RPC marshaling failures. This is needed only in a handful of cases, but it was triggering for simple stuff like temporary resource shortages. Try to straighten this out. Fix up the lower layers so they don't return -ENOMEM or other error codes that the RPC client's FSM doesn't explicitly recognize. Also fix up the places in the send_request path that do want a disconnect. For example, when ib_post_send or ib_post_recv fail, this is a sign that there is a send or receive queue resource miscalculation. That should be rare, and is a sign of a software bug. But xprtrdma can recover: disconnect to reset the transport and start over. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Tested-by: Steve Wise <swise@opengridcomputing.com> --- net/sunrpc/xprtrdma/fmr_ops.c | 6 +++--- net/sunrpc/xprtrdma/frwr_ops.c | 13 +++++++------ net/sunrpc/xprtrdma/rpc_rdma.c | 2 +- net/sunrpc/xprtrdma/transport.c | 20 +++++++++++++++----- net/sunrpc/xprtrdma/verbs.c | 22 +++++++++++++--------- 5 files changed, 39 insertions(+), 24 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html